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Vespa Smallframe Polini Evo 133

Vespa Smallframe with Polini cylinder over 20HP

 

Today our customer John was again with his Vespa Smallframe on our Scooter Center Test bench.

Where can I find a few more horsepower in my Vespa engine? John

More power for the Vespa

During his last visit, he asked us what changes he could still make to his engine in order to find a little more power.

After we had briefly discussed what its current setup looks like, we were actually able to give some pointers through which more top performance can be obtained.

 

Motor setup

Basically, the engine is equipped with a Polini Evo cylinder, a 54 bgm crankshaft. The 30th Mikuni TMX carburetor is attached to an MRP suction device. The very best prerequisites to become a clear Ü20 unit.

With an additional processing of the outlet and the conversion of the Polini membrane to 2 flaps, the following result comes out:

 

Polini Evo 133 Vespa Smallframe on the test stand Polini Evo 133, L&S Franz, Polini Membrane, MRP

With Kytronic even better

Due to the larger outlet area, the exhaust can work much better. The small loss at 6500rpm is unfortunately due to the missing Kytronic. In the current state (red curve), a standard PK ignition system provides a ZZP of 18 ° before TDC. their service. With the Kytronic it is certainly possible to shift the red curve back to the left at 200 rpm, in the direction of the performance that starts earlier.

But all in all a nice number - have fun with it on the street!

 

(AS)

 

Thomas from Aachen visited us with a rather bizarre conversion concept on his Smallframe Engine.

In here comes from the Malossi program 172cc cylinder used, which is actually intended for the Piaggio automatic models TPH and SKR.
With some effort, Thomas was able to put the cylinder on a Vespa Smallframe Adjust the motor housing.

You can find more detailed information on this in the GSF

Some of these individual projects bring about rather dubious "improvements for the worse".

In the case of Thomas' engine, however, one can speak of a very suitable conversion.

In comparison, you can see an early one in the diagram VSP and a typical Smallframe Exhaust, the Franz.

All in all, these are extremely good values ​​that are sure to be easy to move on the road. It doesn't always have to be the Ü30PS, the corresponding torque also makes you fast, fast.